As a green pollution-free reaction, oxygen reduction reaction (ORR) plays a significant role in many energy storage and conversion devices. Although commercial Pt/C possesses the highest ORR activity (especially in acidic medium), the high cost, low stability and poor methanol tolerance making the development of non-platinum electrocatalysts with high performance especially important. Herein, we design

Proton-conducting solid oxide fuel cell (H–SOFC) is more competitive compared to oxygen-conducting SOFC (O–SOFC) due to its lower conductive activation energy, higher fuel conversion rate, and higher Nernst potential. However lack of suitable cathode is hindering its application. A double perovskite Nd(Ba0·75Ca0.25)Co1·5Fe0·4Ni0·1O5+δ (NBCCFN) has been prepared and evaluated as a potential cathode

The relatively large number of adjustable parameters often precludes the unambiguous interpretation of electrochemical impedance spectroscopic (EIS) measurements in terms of a unique kinetic model. An approach to overcome this ambiguity by parameterization of a model of barrier film growth and dissolution on Ti in fluoride-containing solutions using a combination of in-situ EIS and photocurrent measurements

With the advantages of accurate and elaborate, the application of the electrochemical models has become a potential trend for states estimation of Li-ion batteries in advanced battery management systems (BMS). This paper presents an original approach for joint estimation of state-of-charge (SoC) and state-of-health (SoH) based on the pseudo-two-dimensional (P2D) model. First, the standard P2D model

Core-shell Mn3O4/carbon (Mn3O4@C) hybrid fiber are synthesized by encapsulating Mn3O4 nanoparticles (NPs) in the hollow carbon fibers (Mn3O4@HCFs) according to the coaxial electrospinning technique. As the aqueous Zinc ion battery (ZIBs) cathode, the well-defined Mn3O4@HCFs with 12.7 wt % carbon exhibits superior rate capability (215.8 and 115.7 mAh g−1 at 0.3 and 2.0 A g−1, respectively) and excellent

The homogeneous electrocatalytic mechanism with a fast catalytic chemical reaction between a series of ferrocene derivatives and l-cysteine/N-Acetyl-l-cysteine (NAC) is systematically investigated. A comparison of different cyclic voltammetric waveforms is given to illustrate the interaction between kinetic parameter (λ) and excess factor (γ) in kinetic zone diagram via changing the scan rates and

Transition metal oxides (e.g. NiO) have been considered as promising high-capacity anode in lithium ion batteries (LIBs). However, the low electronic conductivity and huge volume change during cycling lead to rapid capacity fading and poor rate capability. To solve those drawbacks, we design a sandwich-like dual carbon layers coated hollow structured NiO ([email protected]@NC). The NiO nanosheets are

Performance degradation of Pt nanoparticles is considered to be among the most severe problems for electrochemical reactions. Pt–TiO2 catalysts are widely studied due to the optical effect of TiO2, which is beneficial for electron transfer during methanol oxidation. However, different configurations of these catalysts are insufficient in research. Here, we report rationally designed Pt nanoparticles

Effectively adsorbing and suppressing the polysulfide shuttle by polar materials are of great importance in lithium-sulfur (Li–S) batteries. Herein, the multifunctional [email protected] MS heterostructure consisting of porous carbon shell and SnS microflower-like core is prepared and demonstrated as an efficient Li–S battery cathode with electrocatalytic activity. The integrated physical confinement

The electrochemical model is widely studied because of its capability to accurately describe various reactions inside the lithium-ion battery. In this paper, the impedance from 10 mHz to 1 kHz of the Pseudo 2-Dimensional (P2D) model is analyzed, and it is found that the impedance characteristics of the P2D model only at low frequencies (below 0.5 Hz) are consistent with those of actual batteries. In

Understanding the mechanisms at the basis of the charge/discharge characteristics of cathode materials is mandatory for lithium-ion and post-lithium-ion batteries optimal development. Here, we theoretically propose bipolarization of cathode particles, as a noble governing mechanism for charge-discharge behaviors, capable to justify many phenomena including the voltage hysteresis (VH) and the first-charge

Li2TiSiO5 (LTSO) fibers coated by an in-situ grown Li-Ti-O layer are synthesized through ALD and post thermal treatment. Due to the ALD coating technique, precise thickness control and conformal coating layer can be realized. Through post-heating treatment, the ALD-coated TiOx layer can react with lithium in the host materials, forming the Li-Ti-O coating layer. Benefiting from the Li-ion conductive

In the study, the hydrogen storing materials Mg–Ni-based Mg50-xTixNi45Al3Co2 (x = 0, 1, 2, 3, 4) + 50 wt% Ni (named Mg50-xTixNi45Al3Co2 (x = 0–4) + 50Ni) with nanocrystalline and amorphous structures were fabricated by the method of mechanical milling and designed for the negative electrode of Ni–MH batteries. The investigation aims at researching the function of Ti dosage on the electrochemical hydrogen

This work reports the preparation, structural, electrochemical, and dielectric properties of the nanocomposite solid electrolyte (100KPbI3) accumulating TiO2 filler of different weight percentages (wt %) varying from 1 to 5 wt %. The electrical functioning of the materials is figured out via ac and dc conductivity using LCR meter. The influence of concentration displaying the maximum conductivity and

We develop a facile and low-cost method to construct porous N-doped carbon sheets wrapped MnO cubes with average size of 150 nm in 3D carbon networks by one-step pyrolysis strategy. The unique and novel nanostructure not only provides holes to promote fast ion transport and conductive framework to enhance the charge transfer, but also effectively supplies an elastic buffer space to accommodate volume

Salinity gradient (SG) energy is a large untapped energy source available worldwide. Here we applied MoS2 with tunable interlayer spacing to a concentration flow cell for efficient SG energy recovery. By expanding the interlayer from 0.63 nm to 0.96 nm, the ion diffusion resistance was significantly reduced and the pseudocapacitance was largely promoted. These enhanced electrochemical properties resulted

Transition metal oxides are expected to replace commercial graphite for the next generation of secondary battery anode materials. However, the capacity decreases rapidly due to poor conductivity and volume expansion during operation. In this study, we first designed a yolk-shell structured ZnCo2O4 sphere, and then combined it with reduced graphene oxide through an electrostatic interaction process

Zinc-air batteries are the promising electrochemical energy conversion and storage devices due to their high theoretical energy density, environmental benignity, low cost and safety. Developing high-performing bifunctional catalyst to improve the ORR and OER kinetic is the key issue of the researchable zinc-air battery. In this work, ultra-thin NiCo2S4 nanosheets with reduced graphene oxide hybrid

High performance supercapacitors are designed based on hierarchical Ni(OH)2 nanosponges anchored on sulfur-enriched polyaniline (PANI) nanotubes and waste tyre-derived onion-like carbons (OLC) as counter electrode materials. The rational strategy of grafting mesoporous thin sheets of Ni(OH)2 on PANI produces unique composite nanoarchitectures that shows superior potential in supercapacitors validated

Herein we present investigations of electrochemical behavior over a series of selected bisicosahedral cobalt bis(heteroborane)(1-) derivatives in aqueous phosphate buffers. This pilot study is focused on distinct effects connected with either exo-skeletal substitutions at boron atoms with bridging and non-bridging groups or by influence of endo-hedral replacement of four cage CH groups present in the

For the efficient electrochemical glucose oxidation on the electrode modified with redox hydrogel involving Os-tethered polymer and flavin adenine dinucleotide-dependent glucose dehydrogenase (FADGDH), the effect of pore size of MgO-templated carbon (MgOC) as an electrode material was studied. The MgOC was modified on glassy carbon electrode by ink-drop-casting technique. The MgOC pore size clearly

Spinel LiNi0.5Mn1.5O4 (LNMO) is a competitive cathode material for the next generation high energy density lithium ion batteries (LIBs) because of its high potential (4.7 V) and acceptable theoretical capacity (146.7 mAh g−1). Nevertheless, it suffers from severe capacity decay during cycling, especially at elevated temperatures. Herein, we propose an integrated modification strategy combing Li+-conductive

Silicon with higher theoretical capacity than that of the commercial graphite anode is considered as the next generation lithium ion battery anode materials. Herein, our research demonstrates that the surface SiOx coating with silanol groups generated in aqueous solution on silicon nanoparticles can efficiently improve their electrochemical performance. The SiOx layer can suppress the volume expansion

Helical silica nanofibers have been prepared based on a sol-gel transcription approach. After covering a layer of m-phenylenediamine formaldehyde resin and consequent carbonization, SiO2@Fe–N doped C nanofibers with C content of 33.7 wt% and N content of 3.86 wt% were produced successfully. When applied as the electrode material for lithium-ion batteries (LIBs), they exhibit a high reversible capacity

Zinc (Zn) is a low-cost material that is widely used in plating and is under consideration as a reversible deposit for a range of energy storage applications. In recent years, researchers have demonstrated that the Zn morphology can be tuned by electrodepositing from an ionic liquid often leading to morphologies that improve cyclability. However, the underlying mechanisms that control deposition and

In this work we assess the influence of physiological viscosities on metalloprotein electron transfer reactions. To that end we investigated the direct electrochemistry of the copper proteins azurin and CuA adsorbed on SAM-coated electrodes. The experimental results show a change of ET regime from non-adiabatic to friction control upon shortening tunneling distances, which is paralleled by a sigmoidal

The present work is devoted to study the effect of the Graphene Oxide (GO) addition in the corrosion protection capacity of a commercial Rust Converter (RC). These substances are designed to be applied over corroded surfaces. It is supposed that they react with rust generating a stable layer, which protects to the metallic substrate. The RC used here is a commercial product that contains gallic acid

Benzyl viologen (BV) was deposited at copper in the presence of chloride anions to generate a benzyl viologen-chloride layer at copper, where the viologen was present as a dication, stabilised by the negatively charged chloride anions. This layer provided good protective properties to the underlying copper substrate. On polarising the BV-modified copper in 0.1 M NaCl significantly lower currents, typically

Spinel LiNi0·5Mn1·5O4 (LNMO), though being considered as a promising cathode material because of their high energy and power density, always suffers from rapid capacity deterioration due to the Jahn-Teller effect and severe leakage of Mn ions into electrolytes at elevated temperatures. In this work, Li3BO3 (LBO) formed from slow hydrolysis of triethyl borate was coated on the surface of LiMn1·5Ni0·5O4

The low-temperature molten Na3AlF6–K3AlF6–AlF3 salts was evaluated in order to perform the electrochemical reduction of vanadium sesquioxide. By using cyclic voltammetry and constant potential electrolysis, the cathodic reduction reactions were determined and the promoting effect of oxygen concentration in the electrolyte on the process was proved. A rapid electro-reduction of vanadium sesquioxide

For developing high-energy-density nickel-rich layered oxide cathodes with extended cycle life and rate capability, it is necessary to mitigate mechanical degradation caused by volume change and surface side reactions between cathode and electrolyte. To overcome these problems, a novel single crystalline LiNi0.8Co0.1Mn0.1O2 material is coated by Li-reactive materials. Results show that the degree of

High-capacity lithium- and manganese-rich cathodes play a critical role in the development of the advanced Li-ion batteries. However, the severe capacity fading and voltage decay impede their commercial applications. Herein, the vacancy-enriched Li1·2Ni0·13Co0·13Mn0·54O2 cathodes with spinel/defective structure shell are realized by the gas-solid reactions (GSR) and the followed Li–Nb–O coating shell

A novel quantitative electrochemical aging model for lithium-ion batteries considering side reactions is proposed in this paper. The resistance of solid electrolyte interphase and the thickness of deposited layer caused by side reactions are utilized as degradation representatives to explicitly quantify the aging effects. The aging model is established through deriving the transfer function relationship

Ion transfer reaction at the water (W)|low dielectric constant organic solution (O) interface was investigated using cyclic voltammetry with a micro-interface electrolytic cell. Organic solvents used in this work were benzene, anisole and chloroform, in addition to the previously reported toluene. The transfer reactions of quaternary ammonium ions and anions across the W|low dielectric constant O interface